ω介子光致产生中核子共振激发的证据。
Evidence for nucleon-resonance excitation in omega-meson photoproduction.
作者信息
Ajaka J, Assafiri Y, Bouchigny S, Didelez J P, Fichen L, Guidal M, Hourany E, Kouznetsov V, Kunne R, Mushkarenkov A N, Nedorezov V, Rudnev N, Turinge A, Zhao Q
机构信息
IN2P3, Institut de Physique Nucléaire, 91406 Orsay, France.
出版信息
Phys Rev Lett. 2006 Apr 7;96(13):132003. doi: 10.1103/PhysRevLett.96.132003.
The photoproduction of the omega meson has been studied at GRAAL from threshold up to a photon energy of 1.5 GeV. The differential cross sections and beam asymmetries have been measured precisely at all angles. The total cross section is also obtained. Systematic enhancements of the differential cross section at large angles and nonzero beam asymmetries at intermediate angles provide clear evidence for s- and u-channel resonant processes. The data are compared to the results of hadron and quark models.
在GRAAL装置上研究了ω介子的光生反应，研究范围从阈值到光子能量为1.5 GeV。精确测量了所有角度的微分截面和束流不对称性。还得到了总截面。大角度处微分截面的系统性增强以及中间角度处非零的束流不对称性为s道和u道共振过程提供了明确证据。将这些数据与强子模型和夸克模型的结果进行了比较。
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